2018 position was this: Russia, and other foreign countries, including China and Iran, conducted influence activities and messaging campaigns targeted at the United States to promote their strategic interests.
for the complete unclass assessment on the 2020 election see
https://www.dni.gov/files/ODNI/documents/assessments/ICA-declass-16MAR21.pdf
In 2020 two statements: One indicates China did nothing to influence the 2020 election and the other says Iran had influence campaigns directed at Trump but not favoring Biden.
The IC is bending over backwards to make China look good, when it is anything but. China has long running influence campaigns. They don't need to influence the election because those influence campaigns are successful.